Distinct Non-additive Customer Count CUBE

I want to build a cube with coustomer count and multiple dimensions, i would have aprox 60 to 80M records.

The count is not additive value (Ex: count of Jan 10, Count Feb 20,Count of Mar 30 but the Q1 count would be 15) because one customer can exists in different areas,but at corporate level he will be counted as 1 but he can exists in different areas and be counted.

In this case if i use my customer Dimension then my cube size is going to be very huge because i have 2M records in my Customer Dimension.

Without using customer dimension in the cUbe is there any way of calculating distinct non additive customer count accross all other Dimensions?????

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